Rock drill



FIG. 1 is a front view of a rock drill bearing the design, wherein therock drill is a single piece extending continuously in a single axialdirection from the bottom end to the tip portion, and wherein thesingle-piece rock drill is depicted in three parts side-by-side forillustrative purposes only, and to show details of the tip portion;

FIG. 2 is a cross-sectional view of the rock drill taken along line 2—2in FIG. 1;

FIG. 3 is a right-side view of the rock drill, wherein the single-piecerock drill is depicted in three parts side-by-side for illustrativepurposes only, and to show details of the tip portion;

FIG. 4 is a bottom view of the rock drill;

FIG. 5 is an enlarged top view of the rock drill;

FIG. 6 is an enlarged detail view of the tip portion of the rock drillshown in the circle labeled 6 in FIG. 3; and,

FIG. 7 is an enlarged detail view of the tip portion of the rock drillshown in the circle labeled 7 in FIG. 1.

The broken lines in FIGS. 5-7 are for illustrative purposes only andform no part of the claimed design.

The ornamental design for a rock drill, as shown and described.